'Remaining Printing Time' is gone

I'm relatively new to 3D-Printing and got my S4 about a month ago.

After setting it up and running very well with Repetier Host, it always showed the remaining Time for the print to end.

After trying different slicers for different Problems, I suddenly get always a remaining Time of -55 seconds.

I'm doing all the preparing and slicing on my Desktop-Computer and have a Notebook at the Printer to simply send the Code to the S4.

So, what did I break, because the Problem with the wrong Time is on both the Desktop and the Notebook.

Even old Code that already ran with the correct Time-Calculation, gives me now these -55 seconds.